In Season 1 episode entitled "Hot Dogs" Weevil gives Veronica the secret message pen at the end of the epi. Do we ever find out if there was a secret message from Weevil and what it said?

As I remember it, we never found out if there was a message, but we can assume there might have been. No, it was never revealed was it said. It was a little secret between Weevil & Lilly that was left open for guess.